For those aiming to download videos from MS Teams meetings in which you participated but were not the Organizer, I managed to do so using yt-dlp and ffmpeg. The procedure is quite similar for both tools.
- Open your Browser (I got it to work in Chrome, Edge and Firefox)
- Login to portal.office.com
- Go to where you can play the video you want to download, either via Sharepoint or Streams.
- Hit F12
- Go to the "Network" tab
- Filter: videomanifest
- Hit F5
- Start playing the video